I bought a set of BBK L/T's with 6,000 miles on them for $75. If you look around, you'll find a deal. I personally wouldn't bother with shorties. I've had them before and they're a waste of money. And not to mention the install in a PITA!!! :rant:
Id shop around for a used pair of L/T's. You wont see much of a gain between the bbk shorties and your stock manifold. The only shorties i've heard of that are worth the swap are JBA's. Otherwise, not worth the hassle.